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1/ Performances are boosted in the second benchmark on all operations (read, write...) on filesizes >= 1G that is to say above the caches/buffer-caches size I believe by 20 to 50%
However
2/ Reader / Re-Reader / Backward read / Stride read tests show a significant performance drop (about -20%) on operations on filesizes < 2M with +40 to +200% cpu consumption.